Sterling Silver Black Diamond Heart in Heart Pendant Necklace (.17 cttw), 18" A small heart of black diamonds floats in the center of this swirling sterling silver heart pendant, which is suspended from a delicate cable chain. Crafted in rhodium-plated .925 sterling silver All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Imported Carat weight listed is the total for all stones.